# git rev-parse -q --verify d4bf905307a1c90a27714ff7a9fd29b0a2ceed98^{commit}
d4bf905307a1c90a27714ff7a9fd29b0a2ceed98
already have revision, skipping fetch
# git checkout -q -f -B kisskb d4bf905307a1c90a27714ff7a9fd29b0a2ceed98
# git clean -qxdf
# < git log -1
# commit d4bf905307a1c90a27714ff7a9fd29b0a2ceed98
# Author: Christophe Leroy <christophe.leroy@c-s.fr>
# Date:   Fri Feb 7 17:20:57 2020 +0000
# 
#     powerpc: Fix CONFIG_TRACE_IRQFLAGS with CONFIG_VMAP_STACK
#     
#     When CONFIG_PROVE_LOCKING is selected together with (now default)
#     CONFIG_VMAP_STACK, kernel enter deadlock during boot.
#     
#     At the point of checking whether interrupts are enabled or not, the
#     value of MSR saved on stack is read using the physical address of the
#     stack. But at this point, when using VMAP stack the DATA MMU
#     translation has already been re-enabled, leading to deadlock.
#     
#     Don't use the physical address of the stack when
#     CONFIG_VMAP_STACK is set.
#     
#     Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
#     Reported-by: Guenter Roeck <linux@roeck-us.net>
#     Fixes: 028474876f47 ("powerpc/32: prepare for CONFIG_VMAP_STACK")
#     Tested-by: Guenter Roeck <linux@roeck-us.net>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/daeacdc0dec0416d1c587cc9f9e7191ad3068dc0.1581095957.git.christophe.leroy@c-s.fr
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 d4bf905307a1c90a27714ff7a9fd29b0a2ceed98
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_holly_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  holly_defconfig
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_holly_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0x59f5f8) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_holly_defconfig_powerpc-gcc5
# Build took: 0:00:43.778189